class_docstr: HyperPreprocessor without Hyperparameters to tune.
  
  It would always return the same preprocessor. No hyperparameters to be
  tuned.
  
  # Arguments
      preprocessor: The Preprocessor to return when calling build.
code: def build(self, hp, dataset):
      return self.preprocessor
  
file_path: autokeras/autokeras/hyper_preprocessors.py
imports: from autokeras import preprocessors
  from autokeras.engine import hyper_preprocessor
  from autokeras.utils import utils
label_desc: Use image node_id 2 for calling the DefaultHyperPreprocessor obj's underlying member method code with example usage: obj.build(hp, dataset) and returns: self